Thin set and the new large and heavy tile mortars serve several functions within a tile assembly. They bond to the substrate, support the tile and bond to the back of the tile. When these three key elements are provided, the job will last for many trouble-free years.
However, there are other factors that also contribute to this success. The selection of the appropriate trowel type and notch size is critical. For instance, when a “v” notched trowel is used, the narrow point of the notch does not provide the coverage necessary to properly support the underside of the tile. Using a notch which is too small will not allow enough mortar to be applied and likewise not support the tile.